package com.yao.ecommerce.filter;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import static org.springframework.core.Ordered.HIGHEST_PRECEDENCE;

public class HeaderTokenGatewayFilter implements GatewayFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 从 HTTP Header 中寻找 key 为 token, value 为 hzyao 的键值对
        String name = exchange.getRequest().getHeaders().getFirst("token");

        if ("hzyao".equals(name)){
            return chain.filter(exchange);
        }
        // 标记此次请求没有权限, 并结束这次请求
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        return exchange.getResponse().setComplete();
    }

    @Override
    public int getOrder() {
        return HIGHEST_PRECEDENCE+2;
    }
}
